The process in which a large number of simple molecules combine to form the complex molecule is known as addition reaction.
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The reaction in which atoms combine with unsaturated carbon compounds to form saturated carbon compounds is known as addition reaction. Example:
CH2=CH2Ethene+H2Ni−→CH3−CH3Ethane
The process in which a large number of simple molecules combine to form the complex molecule is known as polymerisation. Example:
Cn H2=CH2Ethene→[CH2−CH2]nPolythene